(19)

(11)

EP 0 726 970 A1

(12)

(43) Date of publication: 21.08.1996 Bulletin 1996/34 (21) Application number: 93903065.0 (22) Date of filing: 12.01.1993

(51) International Patent Classification (IPC):  C25B 9/ 10( . ) C25B 9/ 08( . ) C25B 9/ 00( . ) C25B 13/ 08( . ) (86) International application number: PCT/US1993/000213 (87) International publication number: WO 1994/016121 (21.07.1994 Gazette 1994/17)

(84) Designated Contracting States: DE FR GB (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48640 (US)	(72) Inventors: TSOU, Yu-Min Lake Jackson, TX 77566 (US) MCMICHAEL, James, W. Lake Jackson, TX 77566 (US) BEAVER, Richard, N. +di . (US) (74) Representative: Huber, Bernhard, Dipl.-Chem., et al  Patentanwälte H. Weickmann, Dr. K. Fincke F.A. Weickmann, B. Huber Dr. H. Liska, Dr. J. Prechtel, Dr. B. Böhm, Kopernikusstrasse 9 81679 München 81679 München (DE)